A 38-year-old man has been arrested in connection with the murder of a woman found dead in her office block.
Catherine Marlow relocated to London in 2004
New Zealander Catherine Marlow, 28, was found dead in Vauxhall, south London on Saturday. Post-mortem tests found she died of asphyxiation.
A 28-year-old man, arrested by police on Monday, was later released without charge.
Miss Marlow had been working for the market research company Research Now after arriving in London in 2004.
It is believed Miss Marlow was murdered during the afternoon on Saturday and that few others would have been in the office when she was killed.